lavc: add lavfi metadata support.

This commit introduces a new AVPacket side data type:
AV_PKT_DATA_STRINGS_METADATA. Its main goal is to provide a way to
transmit the metadata from the AVFilterBufferRef up to the AVFrame. This
is at the moment "only" useful for lavfi input from libavdevice:
lavd/lavfi only outputs packets, and the metadata from the buffer ref
kept in its context needs to be transmitted from the packet to the frame
by the decoders. The buffer ref can be destroyed at any time (along with
the metadata), and a duplication of the AVPacket needs to duplicate the
metadata as well, so the choice of using the side data to store them was
selected.

Making sure lavd/lavfi raises the metadata is useful to allow tools like
ffprobe to access the filters metadata (it is at the moment the only
way); ffprobe will now automatically show the AVFrame metadata in any
customizable output format for users. API users will also be able to
access the AVFrame->metadata pointer the same way ffprobe does
(av_frame_get_metadata).

All the changes are done in this single commit to avoid some memory
leaks: for instances, the changes in lavfi/avcodec.c are meant to
duplicate the metadata from the buffer ref into the AVFrame. Unless we
have an internal way of freeing the AVFrame->metadata automatically, it
will leak in most of the user apps. To fix this problem, we introduce
AVCodecContext->metadata and link avctx->metadata to the current
frame->metadata and free it at each decode frame call (and in the codec
closing callback for the last one). But doing this also means to update
the way the tiff decoder already handles the AVFrame->metadata (it's the
only one decoder with frame metadata at the moment), by making sure it
is not trying to free a pointer already freed by the lavc internals.

The lavfi/avcodec.c buffer ref code is based on an old Thomas Kühnel
work, the rest of the code belongs to the commit author.

Signed-off-by: Thomas Kühnel <kuehnelth@googlemail.com>
Signed-off-by: Clément Bœsch <ubitux@gmail.com>

doc/APIchanges

@@ -15,6 +15,13 @@ libavutil:     2011-04-18
 
 API changes, most recent first:
 
+2012-10-21 - xxxxxxx - lavc  54.68.100 - avcodec.h
+                       lavfi  3.20.100 - avfilter.h
+  Add AV_PKT_DATA_STRINGS_METADATA side data type, used to transmit key/value
+  strings between AVPacket and AVFrame, and add metadata field to
+  AVCodecContext (which shall not be accessed by users; see AVFrame metadata
+  instead).
+
 2012-09-27 - a70b493 - lavd 54.3.100 - version.h
   Add LIBAVDEVICE_IDENT symbol.
 

libavcodec/avcodec.h

@@ -942,6 +942,12 @@ enum AVPacketSideDataType {
      * @endcode
      */
     AV_PKT_DATA_JP_DUALMONO,
+
+    /**
+     * A list of zero terminated key/value strings. There is no end marker for
+     * the list, so it is required to rely on the side data size to stop.
+     */
+    AV_PKT_DATA_STRINGS_METADATA,
 };
 
 typedef struct AVPacket {
@@ -3091,6 +3097,13 @@ typedef struct AVCodecContext {
     int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
     int64_t pts_correction_last_pts;       /// PTS of the last frame
     int64_t pts_correction_last_dts;       /// DTS of the last frame
+
+    /**
+     * Current frame metadata.
+     * - decoding: maintained and used by libavcodec, not intended to be used by user apps
+     * - encoding: unused
+     */
+    AVDictionary *metadata;
 } AVCodecContext;
 
 AVRational av_codec_get_pkt_timebase         (const AVCodecContext *avctx);

libavcodec/tiff.c

@@ -1018,8 +1018,9 @@ static int decode_frame(AVCodecContext *avctx,
     s->compr = TIFF_RAW;
     s->fill_order = 0;
     free_geotags(s);
-    /* free existing metadata */
+    /* metadata has been destroyed from lavc internals, that pointer is not
-    av_dict_free(&s->picture.metadata);
+     * valid anymore */
+    s->picture.metadata = NULL;
 
     // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
     // that further identifies the file as a TIFF file"
@@ -1169,8 +1170,6 @@ static av_cold int tiff_end(AVCodecContext *avctx)
     TiffContext *const s = avctx->priv_data;
 
     free_geotags(s);
-    if (avctx->coded_frame && avctx->coded_frame->metadata)
-        av_dict_free(&avctx->coded_frame->metadata);
 
     ff_lzw_decode_close(&s->lzw);
     if (s->picture.data[0])

libavcodec/utils.c

@@ -1592,6 +1592,31 @@ static void apply_param_change(AVCodecContext *avctx, AVPacket *avpkt)
     }
 }
 
+static int add_metadata_from_side_data(AVCodecContext *avctx, AVFrame *frame)
+{
+    int size, ret = 0;
+    const uint8_t *side_metadata;
+    const uint8_t *end;
+
+    av_dict_free(&avctx->metadata);
+    side_metadata = av_packet_get_side_data(avctx->pkt,
+                                            AV_PKT_DATA_STRINGS_METADATA, &size);
+    if (!side_metadata)
+        goto end;
+    end = side_metadata + size;
+    while (side_metadata < end) {
+        const uint8_t *key = side_metadata;
+        const uint8_t *val = side_metadata + strlen(key) + 1;
+        int ret = av_dict_set(&frame->metadata, key, val, 0);
+        if (ret < 0)
+            break;
+        side_metadata = val + strlen(val) + 1;
+    }
+end:
+    avctx->metadata = frame->metadata;
+    return ret;
+}
+
 int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
                                               int *got_picture_ptr,
                                               const AVPacket *avpkt)
@@ -1630,6 +1655,7 @@ int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *pi
             if (!picture->height)                  picture->height              = avctx->height;
             if (picture->format == AV_PIX_FMT_NONE)   picture->format              = avctx->pix_fmt;
         }
+        add_metadata_from_side_data(avctx, picture);
 
         emms_c(); //needed to avoid an emms_c() call before every return;
 
@@ -1749,6 +1775,7 @@ int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
             if (!frame->sample_rate)
                 frame->sample_rate = avctx->sample_rate;
         }
+        add_metadata_from_side_data(avctx, frame);
 
         side= av_packet_get_side_data(avctx->pkt, AV_PKT_DATA_SKIP_SAMPLES, &side_size);
         if(side && side_size>=10) {
@@ -1901,6 +1928,7 @@ av_cold int avcodec_close(AVCodecContext *avctx)
         avctx->internal->byte_buffer_size = 0;
         av_freep(&avctx->internal->byte_buffer);
         av_freep(&avctx->internal);
+        av_dict_free(&avctx->metadata);
     }
 
     if (avctx->priv_data && avctx->codec && avctx->codec->priv_class)

libavcodec/version.h

@@ -29,7 +29,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 54
-#define LIBAVCODEC_VERSION_MINOR 67
+#define LIBAVCODEC_VERSION_MINOR 68
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \

libavdevice/lavfi.c

@@ -27,6 +27,7 @@
 
 #include "float.h"              /* DBL_MIN, DBL_MAX */
 
+#include "libavutil/bprint.h"
 #include "libavutil/log.h"
 #include "libavutil/mem.h"
 #include "libavutil/opt.h"
@@ -339,6 +340,28 @@ static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
         memcpy(pkt->data, ref->data[0], size);
     }
 
+    if (ref->metadata) {
+        uint8_t *metadata;
+        AVDictionaryEntry *e = NULL;
+        AVBPrint meta_buf;
+
+        av_bprint_init(&meta_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
+        while ((e = av_dict_get(ref->metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
+            av_bprintf(&meta_buf, "%s", e->key);
+            av_bprint_chars(&meta_buf, '\0', 1);
+            av_bprintf(&meta_buf, "%s", e->value);
+            av_bprint_chars(&meta_buf, '\0', 1);
+        }
+        if (!av_bprint_is_complete(&meta_buf) ||
+            !(metadata = av_packet_new_side_data(pkt, AV_PKT_DATA_STRINGS_METADATA,
+                                                 meta_buf.len))) {
+            av_bprint_finalize(&meta_buf, NULL);
+            return AVERROR(ENOMEM);
+        }
+        memcpy(metadata, meta_buf.str, meta_buf.len);
+        av_bprint_finalize(&meta_buf, NULL);
+    }
+
     pkt->stream_index = stream_idx;
     pkt->pts = ref->pts;
     pkt->pos = ref->pos;

libavfilter/avcodec.c

@@ -33,6 +33,9 @@ int avfilter_copy_frame_props(AVFilterBufferRef *dst, const AVFrame *src)
     dst->pos    = av_frame_get_pkt_pos(src);
     dst->format = src->format;
 
+    av_dict_free(&dst->metadata);
+    av_dict_copy(&dst->metadata, av_frame_get_metadata(src), 0);
+
     switch (dst->type) {
     case AVMEDIA_TYPE_VIDEO:
         dst->video->w                   = src->width;

libavfilter/avfilter.h

@@ -180,6 +180,8 @@ typedef struct AVFilterBufferRef {
     int perms;                  ///< permissions, see the AV_PERM_* flags
 
     enum AVMediaType type;      ///< media type of buffer data
+
+    AVDictionary *metadata;     ///< dictionary containing metadata key=value tags
 } AVFilterBufferRef;
 
 /**

libavfilter/buffer.c

@@ -54,6 +54,10 @@ AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
     if (!ret)
         return NULL;
     *ret = *ref;
+
+    ret->metadata = NULL;
+    av_dict_copy(&ret->metadata, ref->metadata, 0);
+
     if (ref->type == AVMEDIA_TYPE_VIDEO) {
         ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
         if (!ret->video) {
@@ -172,6 +176,7 @@ void avfilter_unref_buffer(AVFilterBufferRef *ref)
         av_freep(&ref->video->qp_table);
     av_freep(&ref->video);
     av_freep(&ref->audio);
+    av_dict_free(&ref->metadata);
     av_free(ref);
 }
 
@@ -197,6 +202,9 @@ void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *s
     case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
     default: break;
     }
+
+    av_dict_free(&dst->metadata);
+    av_dict_copy(&dst->metadata, src->metadata, 0);
 }
 
 AVFilterBufferRef *ff_copy_buffer_ref(AVFilterLink *outlink,

libavfilter/version.h

@@ -29,8 +29,8 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  3
-#define LIBAVFILTER_VERSION_MINOR  19
+#define LIBAVFILTER_VERSION_MINOR  20
-#define LIBAVFILTER_VERSION_MICRO 103
+#define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \